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Register Descriptions
18.5.7 USB General Interrupt Status Register (USBIS), offset 0x00A
NOTE: Use caution when reading this register. Performing a read may change bit status.
The USB general interrupt status 8-bit read-only register (USBIS) indicates which USB interrupts are
currently active. All active interrupts are cleared when this register is read.
Mode(s):
OTG A or Host
USBIS in OTG A/Host Mode is shown in
Figure 18-9. USB General Interrupt Status Register (USBIS) in OTG A/Host Mode
7
6
VBUSERR
SESREQ
R-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 18-12. USB General Interrupt Status Register (USBIS) in OTG A/Host Mode Field Descriptions
Bit
Field
7
VBUSERR
6
SESREQ
5
DISCON
4
CONN
3
SOF
2
BABBLE
1
RESUME
0
Reserved
1348
M3 Universal Serial Bus (USB) Controller
OTG B or Device
Figure 18-9
5
4
DISCON
CONN
R-0
R-0
Value
Description
VBUS Error
0
No interrupt
1
VBUS has dropped below the VBUS Valid threshold during a session.
Session Request
0
No interrupt
1
SESSION REQUEST signaling has been detected.
Session Disconnect
0
No interrupt
1
A Device disconnect has been detected.
Session Connect
0
No interrupt
1
A Device connection has been detected.
Start of Frame
0
No interrupt
1
A new frame has started.
Babble Detected
0
No interrupt
1
Babble has been detected. This interrupt is active only after the first SOF has been sent.
RESUME Signaling Detected. This interrupt can only be used if the USB controller's system clock is
enabled. If the user disables the clock programming, the USBDRRIS, USBDRIM, and USBDRISC
registers should be used.
0
No effect
1
RESUME signaling has been detected on the bus while the USB controller is in SUSPEND mode.
0
Reserved
Copyright © 2012–2019, Texas Instruments Incorporated
and described in
Table
18-12.
3
2
SOF
BABBLE
R-0
R-0
SPRUHE8E – October 2012 – Revised November 2019
www.ti.com
1
0
RESUME
Reserved
R-0
R-0
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